Paneer Tikka in Air Fryer

Name: Paneer Tikka in Air Fryer
Ingredients: 1.1 lbs paneer (about 500 grams); 1 small bowl plain yogurt (about 1/2 cup or 120 grams); 2 tablespoons chickpea flour (besan) (about 16 grams); 1 tablespoon ginger-garlic-green chili paste; Juice of 1/2 lemon; 2 tablespoons mustard oil (about 30 ml); 1 tablespoon salt; 1 tablespoon red chili powder; 1 tablespoon ground coriander; 1 tablespoon garam masala; 1/2 tablespoon dried mango powder (amchur); 1/2 tablespoon dried fenugreek leaves (kasuri methi); 1 little oil for brushing; 2 bell peppers; 2 onions